Hello Lorraine,

I've had the same problem with the external customer. :)
Look at the connector's data-sheet. You can often find the recommended hole
size for the actual connector. If not talk to your vendor and ask them to
provide you the document that specifies the recommended hole size. Show it
to the designer that is unwilling to change the layout. If there is another
hole size specified, the designer should admit that the solution he/she
choused is wrong in this application. You can also find out what does it
cost (on the year basis) to press the connectors in to the holes instead of
only soldering it. I assume that you are process/production engineer and it
shouldn't be your job to prove for the designer that the solution is
electrically right or wrong. That's his/hers job. :)
He/she should also make the necessary changes if you can achive more
cost-effective manufacturing of the products.
On the other hand if designer is categorical in his/hers decision, the
responsibility for the product being cost-effective to produce and function
well in the application is not yours.

Go for it. :)))

Sasha Miladinovic

*************************************************************************
Sasha Miladinovic - Production Engineering
Amersham Biosciences, PCB Production, Umeå
Tel:      +46 (0) 90 150 232
Fax:     +46 (0) 90 138 372
E-mail: [log in to unmask]
*************************************************************************



                                                                                                                       
                    "Reid, Lorraine"                                                                                   
                    <Lorraine.Reid@TRI       To:     [log in to unmask]                                                   
                    VIRIX.COM>               cc:                                                                       
                    Sent by: TechNet         Subject:     [TN] connectors and hole diameters                           
                    <[log in to unmask]>                                                                                  
                                                                                                                       
                                                                                                                       
                    2002-02-01 11:45                                                                                   
                    Please respond to                                                                                  
                    "TechNet E-Mail                                                                                    
                    Forum."; Please                                                                                    
                    respond to "Reid,                                                                                  
                    Lorraine"                                                                                          
                                                                                                                       
                                                                                                                       




Can anyone point me in the direction of any investigations into the
potential for long term failures caused by inserting a thru-hole mounted
connector into holes which are slightly too small to fit?

We have a situation where a connector, with square pins, diagonal
dimension 25 thou, is being inserted into plated holes, finished size 22
thou.  The connector is then soldered.   The connector pins can be
forced in, but I am concerned about the potential for damage that may
not appear immediately obvious.  The board is 4 layer, so obviously
there are connections from the holes to the inner layers.  The obvious
solution is to enlarge the holes (not possible for this batch), but the
designer is unwilling to make changes unless we can prove that there is
a genuine risk of failure of the interconnects due to forcing the
connector into the board.

Thanks in advance

Lorraine Reid

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